The wavelength of Kα-characteristic X-rays produced is λ, when cathode rays strike a metal of atomic number Z. What should be the atomic number of metal such that it can produce the Kα-characteristic

Question

The wavelength of Kα-characteristic X-rays produced is λ, when cathode rays strike a metal of atomic number Z. What should be the atomic number of metal such that it can produce the Kα-characteristic X-rays of wavelength 4λ?

Prashant Kotian · Accepted Answer

Correct answer: C. Moseley's Law: 1/√λ = a(Z-1). If λ becomes 4λ: 1/(2√λ) = a(Z'-1). Dividing: 1/2 = (Z'-1)/(Z-1) => Z' = (Z+1)/2.

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